Kai Tomokuni, Kishimoto Mai, Akita Munetaka, Yoshizawa Michito
Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Chem Commun (Camb). 2018 Jan 23;54(8):956-959. doi: 10.1039/c7cc09450g.
Eu(iii)-complexes emit highly pure and intense red luminescence in aprotic organic solvents, yet the emission is usually quenched completely in the presence of aqueous solvents. Here we report that typical Eu(iii)-complexes are readily encapsulated in the hydrophobic cavities of aromatic micelles, composed of amphiphilic molecules with bent aromatic frameworks. Whereas the emissivity of the Eu(iii)-complexes themselves is zero in aqueous solutions, the resultant host-guest nanocomposites exhibit relatively strong red emission (up to Φ = 48%) with long emission lifetimes (up to τ = 1.05 ms) even in water. Thus, encapsulation-induced emission enhancement (EIEE) of the otherwise water-deactivated luminescent compounds is demonstrated by the aromatic micelle.
铕（III）配合物在非质子有机溶剂中发射出高纯度且强烈的红色发光，但在水性溶剂存在下，这种发射通常会完全猝灭。在此我们报告，典型的铕（III）配合物很容易被封装在由具有弯曲芳香骨架的两亲分子组成的芳香族胶束的疏水腔内。虽然铕（III）配合物本身在水溶液中的发射率为零，但即使在水中，所得的主客体纳米复合材料也表现出相对较强的红色发射（高达Φ = 48%）和长发射寿命（高达τ = 1.05 ms）。因此，芳香族胶束证明了原本被水猝灭的发光化合物的封装诱导发射增强（EIEE）。
